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BLOOD: Today's opportunity to donate blood is at Brewers Hall in the City of London. Free, see site for terms and condition
MIGRATION: 100 Images of Migration is a new exhibition at Hackney Museum that displays 100 photographs about migration in and out of Britain. The images cover the entire country and the last century. Free, just turn up, until 31 August
UNIVERSE GUIDE: The Southbank Centre opens an Alternative Guide to the Universe today — an exhibition that explores the work of self-taught artists, architects, physicists and inventors, and their unorthodox perspectives on the world we live in. £11, prebook, until 26 August
LEGACIES OF SLAVERY: UCL's Lunch Hour Lectures are on tour. Today head to the Museum of London Docklands to hear what the British Empire gained — or at least believed it was gaining — from the slave trade. Free, just turn up, 1.15pm
GOTHIC ATTRACTIONS: Performing hangmen, self-crucifiers and starving brides. Writer and showman Mervyn Heard presents this illustrated talk about the bizarre, live theatrical experiences of the 18th, 19th and early 20th century. £7, prebook, 7pm
ART CAFE: Kingsley Hall DIY Art Cafe is a forum in Bow for the local community to engage with art, radio, film and music. There will be talks and demonstrations from industry experts, see the website for the great line up. Donate what you can, just turn up, 7pm
LIT: Marcel Theroux discusses his SF novel Strange Bodies with his father Paul at Daunt Books Marylebone. £8, prebook, 7pm
SOUTH ASIAN DANCE: The premier of the South-Asian short dance film The Art Of Defining Me screens tonight at Rich Mix. £5, prebook, 7pm
DIAMONDS: The most coveted of gems is wasted in jewellery, argues Richard Jackman tonight. The London Centre for Nanotechnology Professor is at the Cittie of Yorke pub tonight to give a Cosy Science talk on how diamonds do so much more than sparkle. Free, just turn up, 7pm
COMEDY: David Mills and John-Luke Roberts lead the funnies at Uncle Henry’s Classy Hour, Camden Head tonight. Free, just turn up, 7.30pm
LIAR'S LEAGUE: Liar's League is a night of storytelling, where writers write stories for actors to read. Tonight's event at The Phoenix is Kings and Queens themed. £5, just turn up, 7.30pm
BACONFACE: Baconface: either an underground veteran Canadian comedian or Stewart Lee in a bacon mask: you decide at the Soho Theatre. £7.50, prebook, 9.45pm
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Good Cause of the Day
Save the Children is raising awareness of the impact of child hunger with their I’m a Piece project. Over 700 people all over the UK have hand-stitched jigsaw pieces with messages to MPs asking them to work towards reducing world hunger. Head to The Railway Pub in Streatham tomorrow for a Crafty Pint evening, where you can see the collection and make your own piece. Free, just turn up, Wednesday 12 June at 7.30pm
London Puzzle of the Week
Today's clue-word is ROGER. Three more words will appear in this section on the remaining weekdays. Come Friday (or sooner if you're alert), you have to work out the connection between the clue-words.
London Weather, by Inclement Atlee
Approximately 187,594,005 kilograms of cloud will pass over London today, give or take a few grams. Roughly 291,000,079 raindrops will fall on the capital between 10.37am and 3.32pm. Sunshine will break through in the latter part of the day, irradiating the city with 9,243,443,839,003,034,442,043,730,910 photons (to the nearest 10). Temperatures will be, like, somewhere in the teens or something.